Pore structure and adsorption properties of carbon xerogels derived from carbonization of tannic acid-resorcinol-formaldehyde resin

1969 ◽

Vol 27 ◽

pp. 328-329 ◽

Cited By ~ 1

Author(s):

J. G. Robertson ◽

D. F. Parsons

Keyword(s):

Electron Microscopy ◽

Osmium Tetroxide ◽

Neutral Lipids ◽

Lipid Extraction ◽

Water Soluble ◽

Formaldehyde Resin ◽

Electron Microscope Autoradiography ◽

Resorcinol Formaldehyde ◽

Major Disadvantage ◽

Cell Organization

The extraction of lipids from tissues during fixation and embedding for electron microscopy is widely recognized as a source of possible artifact, especially at the membrane level of cell organization. Lipid extraction is also a major disadvantage in electron microscope autoradiography of radioactive lipids, as in studies of the uptake of radioactive fatty acids by intestinal slices. Retention of lipids by fixation with osmium tetroxide is generally limited to glycolipids, phospholipids and highly unsaturated neutral lipids. Saturated neutral lipids and sterols tend to be easily extracted by organic dehydrating reagents prior to embedding. Retention of the more saturated lipids in embedded tissue might be achieved by developing new cross-linking reagents, by the use of highly water soluble embedding materials or by working at very low temperatures.

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Carbon Capture Performance of Amino-Modified MIL-101 at Room Temperature

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.395-396.637 ◽

2013 ◽

Vol 395-396 ◽

pp. 637-640

Author(s):

Yi Yang ◽

Zheng Ping Wang ◽

Ling Meng ◽

Lian Jun Wang

Keyword(s):

Carbon Dioxide ◽

Specific Surface ◽

Pore Structure ◽

Carbon Capture ◽

Room Temperature ◽

Ambient Pressure ◽

Metal Organic Framework ◽

Adsorption Properties ◽

Carbon Dioxide Adsorption ◽

Before And After

MIL-101, a metal-organic framework material, was synthesized by the high-temperature hydrothermal method. Triethylenetetramine (TETA) modification enabled the effective grafting of an amino group onto the surface of the materials and their pore structure. The crystal structure, micromorphology, specific surface area, and pore structure of the samples before and after modification were analyzed with an X-ray diffractometer, scanning electron microscope, specific surface and aperture tester, and infrared spectrometer. The carbon dioxide adsorption properties of the samples were determined by a thermal analyzer before and after TETA modification. Results show that moderate amino modification can effectively improve the microporous structure of MIL-101 and its carbon dioxide adsorption properties. After modification, the capacity of MIL-101 to adsorb carbon dioxide decreased only by 0.61 wt%, and a high adsorption capacity of 9.45 wt% was maintained after six cycles of adsorption testing at room temperature and ambient pressure.

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Innentitelbild: Extension of The Stöber Method to the Preparation of Monodisperse Resorcinol-Formaldehyde Resin Polymer and Carbon Spheres (Angew. Chem. 26/2011)

Angewandte Chemie ◽

10.1002/ange.201103443 ◽

2011 ◽

Vol 123 (26) ◽

pp. 5894-5894 ◽

Cited By ~ 2

Author(s):

Jian Liu ◽

Shi Zhang Qiao ◽

Hao Liu ◽

Jun Chen ◽

Ajay Orpe ◽

...

Keyword(s):

Formaldehyde Resin ◽

Carbon Spheres ◽

Stöber Method ◽

Resorcinol Formaldehyde ◽

The Stöber Method

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Effect of the surface properties of resorcinol–formaldehyde resin/carbon nanocomposites and their carbonization products on the solid-phase extraction of explosives

RSC Advances ◽

10.1039/c6ra25822k ◽

2017 ◽

Vol 7 (12) ◽

pp. 7033-7040 ◽

Cited By ~ 5

Author(s):

Viktor M. Bogatyrov ◽

Mariia V. Galaburda ◽

Waldemar Tomaszewski ◽

Jadwiga Skubiszewska-Zięba

Keyword(s):

Solid Phase Extraction ◽

Surface Properties ◽

Solid Phase ◽

Formaldehyde Resin ◽

Phase Extraction ◽

Aqueous Samples ◽

Carbon Nanocomposites ◽

Resorcinol Formaldehyde ◽

Carbon Nanofillers

This is the first application of composites containing carbon nanofillers as effective adsorbents for SPE of explosives from aqueous samples.

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Preparation and enhanced supercapacitance performance of porous carbon spheres with a high degree of graphitization

RSC Advances ◽

10.1039/c4ra09204j ◽

2015 ◽

Vol 5 (3) ◽

pp. 2088-2095 ◽

Cited By ~ 15

Author(s):

Binbin Chang ◽

Baocheng Yang ◽

Yanzhen Guo ◽

Yiliang Wang ◽

Xiaoping Dong

Keyword(s):

Porous Carbon ◽

Formaldehyde Resin ◽

Carbon Spheres ◽

Resorcinol Formaldehyde ◽

Porous Carbon Spheres ◽

High Degree ◽

Degree Of Graphitization

This paper describes the preparation of graphitic porous carbon spheres (GPCS) from spherical resorcinol/formaldehyde resin by Fe-catalysis at 900 °C.

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Effect of Nitric Acid Modification on Characteristics and Adsorption Properties of Lignite

Processes ◽

10.3390/pr7030167 ◽

2019 ◽

Vol 7 (3) ◽

pp. 167 ◽

Cited By ~ 11

Author(s):

Bo Huang ◽

Guowei Liu ◽

Penghui Wang ◽

Xiang Zhao ◽

Hongxiang Xu

Keyword(s):

Nitric Acid ◽

Surface Chemistry ◽

Pore Structure ◽

Surface Properties ◽

Photoelectron Spectroscopy ◽

Metal Ion ◽

Adsorption Properties ◽

Acid Modification ◽

X Ray ◽

Adsorption Performance

The objective of this research was to explore the changes of the pore structure and surface properties of nitric-modified lignite and base the adsorption performance on physical and chemical adsorbent characteristics. To systematically evaluate pore structure and surface chemistry effects, several lignite samples were treated with different concentrations of nitric acid in order to get different pore structure and surface chemistry adsorbent levels. A common heavy metal ion contaminant in water, Pb2+, served as an adsorbate probe to demonstrate the change of modified lignite adsorption properties. The pore structure and surface properties of lignite samples before and after modification were characterized by static nitrogen adsorption, X-ray diffraction, Scanning electron microscope, Fourier transform infrared spectroscopy, zeta potential, and X-ray photoelectron spectroscopy. The experimental results showed that nitric acid modification can increase the ability of lignite to adsorb Pb2+. The adsorption amount of Pb2+ increased from 14.45 mg·g−1 to 30.68 mg·g−1. Nitric acid reacted with inorganic mineral impurities such as iron dolomite in lignite and organic components in coal, which caused an increase in pore size and a decrease in specific surface areas. A hydrophilic adsorbent surface more effectively removed Pb2+ from aqueous solution. Nitric acid treatment increased the content of polar oxygen-containing functional groups such as hydroxyl, carbonyl, and carboxyl groups on the surface of lignite. Treatment introduced nitro groups, which enhanced the negative electrical properties, the polarity of the lignite surface, and its metal ion adsorption performance, a result that can be explained by enhanced water adsorption on hydrophilic surfaces.

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Flax Biomass Conversion via Controlled Oxidation: Facile Tuning of Physicochemical Properties

Bioengineering ◽

10.3390/bioengineering7020038 ◽

2020 ◽

Vol 7 (2) ◽

pp. 38

Author(s):

Leila Dehabadi ◽

Abdalla H. Karoyo ◽

Majid Soleimani ◽

Wahab O. Alabi ◽

Carey J. Simonson ◽

...

Keyword(s):

Chemical Modification ◽

Pore Structure ◽

Surface Charge ◽

Chemical Treatment ◽

Textural Properties ◽

Adsorption Properties ◽

Biomass Composition ◽

Adsorption Sites ◽

Modified Forms

The role of chemical modification of pristine linen fiber (LF) on its physicochemical and adsorption properties is reported in this contribution. The surface and textural properties of the pristine LF and its peroxyacetic acid- (PAF) and chlorite-treated (CF) fiber forms were characterized by several complementary methods: spectroscopy (SEM, TEM, FT-IR, and XPS), thermal analysis (DSC and TGA), gas/water adsorption isotherms, and zeta potential (ξ). The results obtained reveal that the surface charge and textural properties (surface area and pore structure) of the LF material was modified upon chemical treatment, as indicated by changes in the biomass composition, morphology, ξ-values, and water/dye uptake properties of the fiber samples. Particularly, the pristine LF sample displays preferential removal efficiency (ER) of methylene blue (MB) dye with ER ~3-fold greater (ER~62%) as compared to the modified materials (CF or PAF; ER~21%), due to the role of surface charge of pectins and lignins present in pristine LF. At higher MB concentration, the relative ER values for LF (~19%) relative to CF or PAF (~16%) reveal the greater role of micropore adsorption sites due to the contributing effect of the textural porosity observed for the modified flax biomass at these conditions. Similar trends occur for the adsorption of water in the liquid vs. vapour phases. The chemical treatment of LF alters the polarity/charge of the surface functional groups, and pore structure properties of the chemically treated fibers, according to the variable hydration properties. The surface and textural properties of LF are altered upon chemical modification, according to the variable adsorption properties with liquid water (l) vs. water vapor (g) due to the role of surface- vs. pore-sites. This study contributes to an understanding of the structure-adsorption properties for pristine and oxidized flax fiber biomass. The chemical conversion of such biomass yields biomaterials with tunable surface and textural properties, as evidenced by the unique adsorption properties observed for pristine LF and its modified forms (CF and PAF). This study addresses knowledge gaps in the field by contributing insight on the relationship between structure and adsorption properties of such LF biomass in its pristine and chemically modified forms.

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